Safety device for elevators



Aug@ 31 19ML J. DUNLOP SAFETY DEVICE FOR ELEVATORS Filed August 16 1924INUWOJ# ldatented Aug. 31, 1926.

raies.

rarest* JAMES DUNLOP, OF CHICAGO, ILLINOIS, ASSIGNOB TO KAESTNER @cHECI-IT COMPANY,

OF CHICAGO, ILLINOIS, .A CGRORA'IION 0F ILLINOIS.-

SAFETY DEVICE FOR ELEVATORS.

Application filed August 16, 19211.

My invention relates to improvements inl safety devices for elevators,and has particular reference to friction clamp devices adapted to engagethe guide rails at the s sides of the hatchway to brake the movepartsfor effecting the fine adjustment are protected from dust, moisture,corrosion and other like injurious agents.

Further objects and advantages will be` come apparent as the descriptionproceeds.

In the drawings, Figure 1 is a plan view partially in section of thedevice embodying the features of my invention.

Fig. 2 is a fragmentary side view of the winding drum mechanism takenpartially in section along line 2-2 of Fig. 1.

Fig. 3 is a view taken in the plane of line 8-3 of Fig. 1, and showingone end of the winding drum mechanism.

In the exemplary embodiment of the invention, a main supporting ,frame10 is mounted to extend substantially across the hatchway between theT-shaped guide rails 11. This frame is constructed of a pair of parallelspaced channels 12 placed back to back, and connected at both ends bytop and bottom plates 13 and 14 respectively. A plurality of verticalstraps 15 are bolted to the very ends of the channels 12, and areadapted to be connected to some part of the elevator cage to support theframe 10.

Mounted between the channels 12 at each end of the frame 10 is a pair ofclamping jaws 16 adapted to frictionally engage op posite sides of therail 11. Each pair of r jaws is pivotally mounted on avertical pin 1'?supported by the top and bottom plates l'and 14, and held in place bycollars 18. The jaws 16v are provided with rearwardly extending arms 19having forked ends, and in each forked end a cam roller 2O is rotatablymounted on a roller pin 21. The pins 21 of each vset of rollers 2O areconnected by a coiled spring 22 which` tends to move the jaws 16 awayfrom the rail 11.

Mounted between. the rollers' 2Q @ech Serial No. 732,400.

set to move the jaws 16 positively into engagement with the rail 11 isacam or wedge member 28 secured to the outer reduced end of ay slidablescrew shaft or rod 24a The screw shafts 241 are in alinement, areprovided with right and lift hand threads respectively, and extend intoa winding drum mechanism 25 whereby they are adapted to be shiftedlongitudinally. To obtain an equal clamping action at both rails 11, therollers 2O of one set of jaws 16 are adjustable alongslots 26 in theforked ends of the arms 19, thereby shifting the rollers along theirregular surface of the wedge 23, and effecting a coarse relativeadjustment.

The winding rum mechanism 25 comprises a bearing frame 27 mountedbetween the channels 12 substantially midway of their ends and securedthereto by bolts 28.

.The frame 27 is preferably rectangular in cross section, and isprovided with end bearings 29 in which a right and left hand nut SOvisrotatably mounted. rI`he screw shafts 2/1 are threaded into the oppositeends of the nut 30, and are held against rotation by a pair of shaftbearings 31 keyed lthereto and secured to the outer ends of the bearings29 by bolts 32, four for each bearing in the present instance. Mountedon the screw shafts 241 between the nut 30 and the y bearings 31 andinside the bearings 29 are a pair of oil saturated felt washers 33. Bythis construction the threaded parts are completely enclosed and oiled,thereby pro tecting them, from corrosion, dust, moisture and the like,and ensuring the efficient and positive operation of the device. Thescrew shafts 24 can be relatively adjusted to effect a fine adjustmentof the relative clamping action of the two pairs of jaws 16 by removingone or the other of the bearings 31, rotating the shaft the desiredamount, and then. replacing the bearing. Since in the presentinstanceeach bearing 31 is. held in place by four bolts, the smallestadjustment that can be effected is obtained by turning the screw shaftthrough one-fourth turn.

Mounted on the nut 30 for rotation therewith is a winding drum 34 havinga closely spaced spiral groove 35 extending from one end to the other.To provide means for manually rotating the drum 34, the latteris formedintegral with a bevel gear, 36 at one end which meshes with a bevelgear'? mounted to rotate with a square headed. stud 38 in.,t, heif.l"2lime 227.. The 'drum is adapted to be automatically rotated whenthe speed of the carexceeds a predetermined value by a cable 39'wou1'idinV the-groove 35 and extending laterally-from the'trame .27, and thenabout two sheaves ll and Alto any suitable speed governor (not'shown)`.The sheave l0 is mounted ina lateral bracket 42 secured to one of the"channels 12 Ibythe' bolts 28,and the sheave is journaled in a verticalvbracket i3` mounted on the lower sideof one of j the top platesA 18which is extended beyond the channel l2'for this purpose.U n, y

Secured to opposite endsI of the'low'er Vside of ...the trame 27byyrbolts '44 are two .bearings l5 'in whichQisjournaled roller 4Gdirectly under-lying'thedrum Stand engaging fthe cable 39. A An oilbuiter plate 1 -'j' formed with a small'lateral openingflS throughavhich the cable passes outfand underlying the. drinn and` roller, isattachedto tlielowe'r legs of' the channels 12.

.While have yherein disclosed the pre! erred embodiment of my inventionwith considerable particularity for purposes ot illustration, it istobeunderstood that various modifications vand alternative construc j tionsmay be 4made without departing from the spirit and scopefof` theinventionl as eX- pressed in the appended claims.

Iclaimasmy invention: s l. A safety device `for eliwatoi-fscomprising,inc ombination, `a frame adapted to be supported bythe kcage of theelevatoij,'a;pair ottrictionjaws mounted in eaclrend otsaidframefandpositioned to frictionally engage the sides of the'gui'de railsinthe hatchu'f'ay,y

, each jaw v havint'gfV a rearwardly extending arm, rollers mountedr .in said arms, a wedge. member positioned between each pair of f'rol1`ers, right hand andy leftgha'nd screw shafts supporting said wedgemembers and extend! ing into opposite ends of a right hand and left handnut7 a frame having end bearings supporting said nut, V said frainebeing mounted insaid lirst mentioned trame,y shatt bearings keyed tosaid screw shai'ts and rigidly securedin any one oit a plurality ofpositions to said vfirstnientiknied, bearings, libre washers mounted lonksaid screw shafts between the inner ends ofsaid shaftbearings and,theendsfof said nut and inside said endbearings, 'and'ineansfor"rotating said nut. A ,A y l i 2. A safety :device forI elevatorscompris-- ngyincombination, a l frame adapted' to be secured to Vthe,cage of the' elevator, elaine- ,ne' mansfmduted'inthevpnsteld' fSaid"falile" 1V` df 'i mais .een a@ .ha @bwa means fora 'iiatin'g'saidlam @une rela-rafa" lea h frainejinoimte livtliin la frame andina ing" apali oifis'rifare-eid.` beatings a right and left'hand nut journallefdin said bearings, said shafts extending into opposite ends or said nut,shaft bearings splined to saidshafts andsecured in any one ofap'luralityof positions to 'said first mentioned bearings, a winding drum securedto said nut, and means yfor rotating said drum to shift said screwshafts.

3. A safety devic'eor elevators comprising, in combination, a frameadapted to be mounted on the elevator cage, a friction clamp lmountedineach end otsaid lframe and adapted to engage` the adjacent guiderail", lright:hand and lett hand screwfshaftsl having wedge members foractuatingl said clamps, a wii'idingz 'drum -ine'clianism for sliding`said shafts longitudinallyA and 'simul-k taneously in oppositedirections, means Afor coarsely adjusting the. 'relative position of oneof saidy wedge kmembers and clamp,-and means' 'forming part of saidwinding drum mechanism toreffecting'a fine relative 'longi-`- tudmalyadjustment of said shaftsV whereby an equal clamping action car'rbe'obtained.

' el.. A safety device y"for elevators com-A prising, inc'oml'oina'tion',t a frame fada'pte'd'to be secured tothe elevatorcagega friction clampdevice mounted in each endoi'` said fraine,"springmeans tending to render said devices ineffective, wedge vmeansfor'actuating said frictionclamps, a pair otfscrew shaftssupportingsaid'wedge means, a ro tata-ble memb'erhavingright hand andlleft hand screw threads atopposite ends rcspectively, saidyshatsextending into opposite endsot'said rotatr'doleV member, means lforsupporting said rotatable nie'mben4 ineaiisfor ei'ectingl an independent'adjustment of earch shaft with said'rotatablemember, andmeans for:rotating said rotatable member totshift said shafts simultaneously"inopposite'directions.

5. A safetyf devicefor elevators coinprising, in combination, a `frame',a clamp -dc vice mounted rineach'endot vsaid frame, sliding meansforvactuatingsaid clamp devices, a pair of alined 'right liandandlc'ttliand screw shafts Ysupporting said means, a rotatablememb'erhavin'g right? iand and left handscrew connectionswith saidshafts respectively, means foi""enclosin`g said screw connections, meansfor -supporting said ro-V tatable member, and means for holding` vsaidshafts against rotation, "one 'of said rlast Anientionedmeans beingconstructed to provide an independent rotaryjadju'stinent of its shaftsvwithsaid rotatableA member, and inenlsv forrotating said rotatable"memben 6. A safety' l cla'in'pl device comprising, in combination, 'afframe;` f ai clamping :device mounted in 'each 'en *d ofjsaid trainer,awed-ge member 4vpositfnedflto'faetuatek each clamping member", meanstor? adjusting the f operative connection of o1 off-said?4 Wedgevinmbersof right hand and left hand screw shafts supporting said wedge members,a rotatable member having right hand and left hand screw connectionswith the adjacent ends of said shafts, a frame having bearings forsupporting said rotatable member, a shaft bearing splined to one of saidshafts and secured in one of a plurality of positions to one of saidfirst mentioned bearings, said bearings and said rotatable memberserving to enclose the screw threads on said shafts and said rotatablemember, means for oil` ing the screw threads, and means for rotatin saidrotatable member.

t?. A sa-fety clamp device comprising, in combination, a frame, aclamping device mounted in each end of said frame, a wedge memberpositioned to actuate each clamping device, means for adjusting theoperative connection of one of said wedge members with the associatedclamping device, a pair of right hand and left hand screw shaftssupporting said wedge members and extendling in opposite directions, arotatable member having right hand and left hand screw threads engagingsaid shafts, a frame having spaced bearings for supporting said ro`tatable member, a removable shaft bearing splined to one of said shaftsand secured to one of said first mentioned bearings, said shaft bearing,frame and rotatable member serving to enclose the threaded parts, andmeans for rotating said rotatable member.

8. A safety device for elevators comprising, in combination, a frame, a.pair of clamping devices mounted in opposite ends of said frame, wedgemembers for actuating' said devices, a pair of alined shafts supportingsaid wedge members and mounted to move simultaneously in oppositedirections, means for adjusting the operable connection between one. ofsaid wedge members and the associated clamping members, means foradjusting one of said shafts independently of the other, and means formoving said shafts longitudinally.

9. A safety device for elevators comprising, in combination, a frame, apair of clamping jaws mounted in each end-of said frame, said clampingjaws having rearwardly extending arms with rollers, wedge means formoving said rollers apart, means for adjusting the operable position ofone set of said rollers withrespect to the associated wedge member, arotatable member, a pair of sliding rods supporting said wedge members,said rods having respectively right hand and left hand screw threadconnections with said rotatable member, means for supporting saidrotatable member and for holding said rods against rotation, said meansallowing an independent adjustment of one of said shafts relative to theother, and means for rotating said rotatable members.

10. A safety device for elevators comprising, in combination, a frame,clamping jaws mounted in opposite ends of said frame, said clamping jawshaving rearwardly extending arms with rollers, wedge means for movingsaid rollers apart, a rotatable member, a pair of sliding memberssupporting said wedge means and having respectively right hand and lefthand screw thread connections with said rotatable member, means forsupporting said rotatable member and for holding said sliding membersagainst rotation, said means allowing an independent adjustment of oneyof said sliding members relative to the other, and means for rotatingsaid rotatable member.

11. In a safety device for elevators, in combination, a frame having abearing, an internally threaded nut journaled in one end of saidbearing, a longitudinally slidable screw rod extending into the otherend of said bearing and into said nut, a removable bearing splined tosaid rod, a plurality of equally spaced bolts securing said lastmentioned bearing to said frame in any one of a plurality of angularpositions, and a fibre member on said rod between said removable bearingand said nut.

l2. In a safety device for elevators, in combination, a frame having abearing, an internally threaded nut journaled in one end of saidbearing, a. longitudinally slidable screw rod extending into the otherend of said bearing and into said nut, a removable bearing splined tosaid rod, and a plurality of equally spaced bolts securing said lastmentioned bearing to said frame in any one of a plurality of angularpositions.

13. In a safety device for elevators, in combination, a frame having abearing, a rotatable member journaled in one end of said bearing, athreaded rod extending through said bearing into said member, means onsaid rod closing the other end of said bearing and holding said rodagainst rotation, and means for removably securing said last mentionedmeans to said frame, said last mentioned means when released from saidframe allowing said rod and said first mentioned means to yturn as aunit to adjust said rod relative to said member.

In testimony whereof, I have hereunto affixed my signature.

JAMES DUNLOPv

